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Effect of PV roof coverage on the lighting availability, heating, and cooling demands for a Venlo greenhouse in Tehran
, Article 2023 8th International Conference on Technology and Energy Management, ICTEM 2023 ; 2023 ; 978-166545285-4 (ISBN) ; Roshandel, R ; Sharif University of Technology
Institute of Electrical and Electronics Engineers Inc
2023
Abstract
Despite of the fact that yield and water efficiency are higher than open-field cultivation in greenhouses, these structures are highly energy intensive. This is because the inside environmental parameters should be maintained in the proper range so that the plants can grow appropriately. To provide this energy sustainably, different renewable energy sources can be integrated in the greenhouse. Photovoltaic panels can be implemented in agricultural greenhouse to achieve clean vegetable production. However, due to shading effect installing the panels on the greenhouse roof affects the thermal energy demand and light availability inside the structure. This study aims to provide a simulation...
Scenario Evaluation for Nearly Net Zero Energy Greenhouse Considering Photovoltaic, Industrial Symbiosis and Ground to Air Heat Transfer
, M.Sc. Thesis Sharif University of Technology ; Roshandel, Ramin (Supervisor)
Abstract
To meet the high energy demand in greenhouse cultivation, clean technologies have been suggested. This research provides a computational and modeling framework to examine the integration of three systems including a photovoltaic panel, earth_air heat exchanger, and industrial symbiosis, to produce three types of energy (electricity cooling, and heating) in a Venlo-type greenhouse. To estimate the minimum energy required to maintain environmental parameters in optimal plant conditions, an energy demand model was developed with the ability to consider the effect of energy stored in the ground. For a greenhouse in Tehran, the annual heating requirement was calculated as 432 kWh/m2 and 227...
Stress Analysis and Optimum Profile Shape Design in Gas Turbine Engine Disk
, M.Sc. Thesis Sharif University of Technology ; Kouchakzadeh, Mohammad Ali (Supervisor)
Abstract
In this thesis, turbine disk thermo elastic and creep stresses has been extracted and the turbine disk cross-section is optimized. Gas turbine disks are used at high temperature and high rotational speed. Due to high temperatures gradients, the mechanical properties vary along the radius of the disk. Most of the stresses in the gas turbine are exerted by centrifugal force and thermal strains. At first, thermo elastic and creep equations for these disks are derived, assuming plane stress and axisymmetry. The resulting differential equations are nonlinear and can not be solved using analytical solutions. Two methods are used to solve the equations which finally are verified employing the...